Ray Optics & Optical Instruments - NCERT Solutions (Part 4) | Class 12 Physics Ch 9 | CBSE/JEE/NEET
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✔️ Class: 12th
✔️ Subject: Physics CBSE/JEE/NEET
✔️ Chapter: Ray Optics & Optical Instruments (Chapter 9)
✔️ Topic Name: Ray Optics & Optical Instruments - NCERT Solutions (Part 4)
✔️ Topics Covered In This Video (By Dhiraj Sir): This YouTube video covers the fourth part of the Ray Optics & Optical Instruments NCERT Solutions. Dheeraj sir provides step-by-step discussion and explanation of each question from the NCERT textbook. This video is useful for students of class 12 preparing for their CBSE board exams. At the end of the video, Dheeraj sir also provides tips and tricks for better understanding and time management during the exams.
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0:00:00 Introduction: Ray Optics & Optical Instruments - NCERT Solutions (Part 4)
0:01:29 Question 17 to 18: Exercise: Ray Optics & Optical Instruments - NCERT Solutions (Part 4)
Que. 17 Figure shows a cross-section of a 'light pipe' made of a glass fiber of refractive index 1.68. The outer covering of the pipe is made of a material of refractive index 1.44. What is the range of the angles of the incident rays with the axis of the pipe for which total reflections inside the pipe take place, as shown in the figure.
40:59 Question 19 to 21: Exercise: Ray Optics & Optical Instruments - NCERT Solutions (Part 4)
Que. 19 The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall 3 m away by means of a large convex lens. What is the maximum possible focal length of the lens required for the purpose?
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